Isolation grounding three-station mechanism
The four-bar linkage mechanism in the isolation grounding switch addresses the issue of slow switch closure by decoupling manual operation from the closure process, enhancing speed and reducing arc duration to extend contactor life.
Patent Information
- Application Number
- CN202421639044.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-11
AI Technical Summary
During the closing process of the existing three-station isolation grounding switch, the manual driving speed is limited, resulting in too long arc generation time, affecting the contact life.
Using linkage assembly and energy storage spring assembly, the four-link mechanism and limit structure enables rapid linkage between the spindle and the operating shaft, avoid manual speed limits, and form a locked state to prevent arcing.
Improves closing speed, reduces arc generation time, extends contact service life, and simplifies the structure and reduces production costs.
Smart Images
Figure CN223108758U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical switches, in particular to an isolation and grounding three-station mechanism. Background Art
[0002] The existing three-position isolating grounding switch includes an operating shaft, a main shaft, an energy storage spring and a connecting rod transmission mechanism. During the closing process, the operating shaft is manually driven to rotate, and the operating shaft drives the energy storage spring to store energy. After the energy storage spring passes the center, the energy is released, and the main shaft is quickly driven to rotate through the connecting rod transmission mechanism, thereby driving the grounding or isolating switch to close. Before the energy storage spring passes the center, the main shaft is also driven to rotate a certain angle through the connecting rod transmission mechanism, that is, the knife switch will rotate a certain angle toward the closing position, so the closing speed of the switch will be limited by the hand speed. If the hand speed is too slow, the arc will be generated for too long, which will easily burn the contacts and shorten the service life. Utility Model Content
[0003] To this end, the utility model provides an isolation and grounding three-position mechanism, including an operating shaft, a main shaft, a connecting rod assembly and an energy storage spring assembly, the operating shaft and the main shaft are rotatably installed on the switch body; the connecting rod assembly includes a first cam that rotates in conjunction with the operating shaft, a second cam that rotates in conjunction with the main shaft, and a connecting rod arranged between the first cam and the second cam, the connecting rod has a first shaft that cooperates with the first cam, and a second shaft that is hinged to the second cam, the first cam is formed with a movable groove for the first shaft to move therein; the energy storage spring assembly includes an energy storage crank arm and an energy storage spring, one end of the energy storage crank arm is fixed on the main shaft, and the other end is used to cooperate with the energy storage spring; when closing the switch, before the energy storage spring passes the center, the first cam and the connecting rod are in a separated state; after the energy storage spring passes the center, the first cam and the connecting rod are in a coupled state.
[0004] When the first cam and the connecting rod are in a coupled state, the first cam, the connecting rod and the second cam form a four-bar linkage, and the four-bar linkage includes a first connecting rod formed by a line connecting the center of the operating shaft and the center of the first shaft, a second connecting rod formed by a line connecting the center of the first shaft and the center of the second shaft, and a third connecting rod formed by a line connecting the center of the second shaft and the center of the main shaft, wherein, in the closed position, the angle a between the first connecting rod and the second connecting rod is between 0-7°, and the four-bar linkage forms a locked state.
[0005] The switch body is provided with a limiting structure for limiting the connecting rod assembly at the closing position, and the limiting structure includes: a limiting boss, which is provided on the second cam; a limiting shaft, which is provided on the switch body and is located below the main shaft, and the limiting shaft can be against the limiting boss.
[0006] The energy storage spring assembly includes: a connecting rod and a connecting sleeve, which are arranged on the left and right, the connecting sleeve is formed with a slot for the connecting rod to be inserted and allowing it to move, a first spring seat is provided at one end of the connecting rod away from the connecting sleeve, and a second spring seat is provided at one end of the connecting sleeve away from the connecting rod; an energy storage spring is sleeved on the connecting rod and the connecting sleeve, and its two ends are respectively against the first spring seat and the second spring seat; an energy storage crank arm is connected to the first spring seat or the second spring seat through a third axis.
[0007] The switch body is provided with a spring limiting shaft which abuts against the energy storage crank arm when in the open position.
[0008] The movable groove is an arc groove.
[0009] The technical solution of the utility model has the following advantages:
[0010] 1. The utility model provides an isolation and grounding three-position mechanism, including an operating shaft, a main shaft, a connecting rod assembly and an energy storage spring assembly. The connecting rod assembly includes a first cam that rotates in linkage with the operating shaft, a second cam that rotates in linkage with the main shaft, and a connecting rod arranged between the first cam and the second cam. The connecting rod has a first shaft that cooperates with the first cam, and a second shaft that is hinged with the second cam. The first cam is formed with a movable groove for the first shaft to move therein. When closing the switch, the operating shaft drives the energy storage spring assembly to move through the energy storage crank arm. Before the energy storage spring passes the center, the first cam and the connecting rod are in a separated state, that is, the main shaft will not rotate with the operating shaft. After the energy storage spring passes the center, the first cam and the connecting rod are in a coupled state, the energy storage spring releases energy, and the connecting rod assembly is quickly driven to drive the main shaft to rotate together, thereby driving the knife switch to close. Compared with the prior art, the knife switch closing speed is not limited by the hand speed, which ensures the closing speed, shortens the arc generation time, and prolongs the service life of the contact.
[0011] 2. The utility model provides an isolated and grounded three-position mechanism, and the four-bar linkage includes a first link formed by a line connecting the center of the operating shaft and the center of the first shaft, a second link formed by a line connecting the center of the first shaft and the center of the second shaft, and a third link formed by a line connecting the center of the second shaft and the center of the main shaft, wherein, in the closed position, the angle a between the first link and the second link is between 0-7°. The inventor cleverly uses the four-bar linkage to form a locked state for the main shaft and the knife switch, thereby preventing the knife switch from rotating toward the open position under the action of electric repulsion, thereby improving safety and reliability. In this way, there is no need to additionally set up a structure to lock the knife switch when the knife switch is closed, and it has the advantages of simple structure and low production cost.
[0012] 3. The isolating and grounding three-position mechanism provided by the present utility model is provided with a limiting structure on the switch body for limiting the link assembly in the closing position. The limiting structure includes: a limiting boss provided on the second cam; a limiting shaft provided on the switch body and located below the main shaft. Wherein, in the closing position, the limiting shaft can abut against the limiting boss, thereby preventing the first cam from rotating excessively and keeping the four-bar linkage in a locked state. Description of the Drawings
[0013] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0014] Figure 1 It is a schematic structural diagram of the isolating and grounding three-position mechanism of the present utility model in the open state;
[0015] Figure 2 It is a schematic structural diagram of the isolating and grounding three-position mechanism (when the energy storage spring passes through the middle);
[0016] Figure 3 It is a labeled schematic diagram of the four-bar linkage (when the energy storage spring passes through the middle);
[0017] Figure 4 It is a labeled schematic diagram of the four-bar linkage (when the mechanism is in the closing state);
[0018] Figure 5 It is a three-dimensional view of the isolating and grounding three-position mechanism;
[0019] Figure 6 It is a sectional view of the isolating and grounding three-position mechanism.
[0020] Description of the reference numerals: 1. Switch body; 2. Operating shaft; 3. Main shaft; 4. Link assembly; 5. First cam; 6. Second cam; 7. Link; 8. First shaft; 9. Second shaft; 10. Movable slot; 11. First link; 12. Second link; 13. Third link; 14. Fourth link; 15. Energy storage crank arm; 16. Energy storage spring; 17. Limiting boss; 18. Limiting shaft; 19. Connecting rod; 20. Connecting sleeve; 21. First spring seat; 22. Second spring seat; 23. Third shaft; 24. Slot; 25. Spring limiting shaft. Detailed Embodiments
[0021] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0025] Embodiment
[0026] This embodiment provides an isolating grounding three-position mechanism, as Figure 1 and Figure 5 shown, including an operating shaft 2, a main shaft 3, a connecting rod assembly 4, and a energy storage spring assembly.
[0027] The operating shaft 2 and the main shaft 3 are rotatably installed on the switch body 1.
[0028] The energy storage spring assembly, as Figure 5 and Figure 6As shown, it includes a connecting rod 19, a connecting sleeve 20, an energy storage crank arm 15, an energy storage spring 16 and a spring limiting shaft 25. The connecting rod 19 and the connecting sleeve 20 are arranged on the left and right. The connecting sleeve 20 is formed with a slot 24 for inserting the connecting rod 19 and allowing it to move. The end of the connecting rod 19 away from the connecting sleeve 20 is provided with a first spring seat 21, and the end of the connecting sleeve 20 away from the connecting rod 19 is provided with a second spring seat 22. The energy storage spring 16 is sleeved on the connecting rod 19 and the connecting sleeve 20, and its two ends are respectively corresponding to the first spring seat 21 and the second spring seat 22. The energy storage crank arm 15 is connected to the first spring seat 21 or the second spring seat 22 through a third shaft 23; two spring limiting shafts 25 are fixed on the switch body 1 and are used to resist the energy storage crank arm 15.
[0029] The connecting rod assembly 4 is arranged between the operating shaft 2 and the main shaft 3. Figure 1 and Figure 2 As shown, it includes a first cam 5 that rotates in conjunction with the operating shaft 2, a second cam 6 that rotates in conjunction with the main shaft 3, and a connecting rod 7 arranged between the first cam 5 and the second cam 6, the connecting rod 7 has a first shaft 8 that cooperates with the first cam 5, and a second shaft 9 that is hinged to the second cam 6, the first cam 5 is formed with an active groove 10 for the first shaft 8 to move therein, the active groove 10 is an arc groove, when closing, before the energy storage spring 16 passes the center, the first cam 5 and the connecting rod 7 are in the following Figure 1 After the energy storage spring 16 is passed, the first cam 5 and the connecting rod 7 are in the state shown in FIG. Figure 2 When the first cam 5 and the connecting rod 7 are in the coupled state, the first cam 5, the connecting rod 7 and the second cam 6 form a four-bar linkage mechanism, as shown in FIG. Figure 3 and Figure 4 As shown, the four-bar linkage includes a first link 11 formed by a line connecting the center of the operating shaft 2 and the center of the first shaft 8, a second link 12 formed by a line connecting the center of the first shaft 8 and the center of the second shaft 9, a third link 13 formed by a line connecting the center of the second shaft 9 and the center of the main shaft 3, and a fourth link 14 formed by a line connecting the center of the operating shaft 2 and the center of the main shaft 3. Figure 4When in the closing position shown, the angle α between the first connecting rod 11 and the second connecting rod 12 is between 0° and 7°. The first connecting rod 11 and the second connecting rod 12 are within the "dead zone" range, and the four-bar linkage forms a locked state. When the angle α between the first connecting rod 11 and the second connecting rod 12 is 0°, that is, the first connecting rod 11 and the second connecting rod 12 are in a collinear position, forming a "dead point" position. To prevent the electric repulsive force generated when the knife switch passes through a short-circuit current from separating the knife switch from the static contact, the above four-bar linkage can form a locked state on the main shaft 3 and the knife switch in the closing position.
[0030] The switch body 1 is provided with a limiting structure for limiting the linkage assembly 4 in the closing position. The limiting structure includes: a limiting boss 17 provided on the second cam 6; a limiting shaft 18 provided on the switch body 1 and located below the main shaft 3, and the limiting shaft 18 can abut against the limiting boss 17.
[0031] The working principle of the isolation and grounding three-position mechanism (taking the grounding operating shaft as an example) of the present utility model is as follows:
[0032] When grounding and closing, the handle is inserted into the grounding operation hole, driving the grounding operating shaft 2 to rotate counterclockwise, thereby driving the first cam 5 and the energy storage crank arm 15 to rotate counterclockwise. Before the energy storage spring 16 passes the middle, the first cam 5 and the connecting rod 7 are in a separated state, and the first shaft 8 of the connecting rod 7 moves from the lower end to the upper end of the movable slot 10 (in fact, the connecting rod 7 does not move, and the first shaft 8 of the connecting rod 7 moves relative to the movable slot 10); after the energy storage spring 16 passes the middle, the energy storage spring 16 releases energy, and the upper end of the first cam 5 abuts against the first shaft 8, thereby driving the main shaft 3 to rotate clockwise through the connecting rod 7 and the second cam 6.
[0033] It should be noted that the switch body 1 is also provided with an isolation operating shaft and a linkage assembly provided between the isolation operating shaft and the main shaft. The structures of the isolation operating shaft and the grounding operating shaft are the same, so the working process will not be described in detail.
[0034] The isolation and grounding three-position mechanism provided by the present utility model includes an operating shaft 2, a main shaft 3, a linkage assembly 4, and an energy storage spring assembly. When closing, the operating shaft 2 drives the energy storage spring assembly to act through the energy storage crank arm 15. Before the energy storage spring 16 passes the middle, the first cam 5 and the connecting rod 7 are in a separated state, that is, the main shaft 3 will not rotate together with the operating shaft 2. After the energy storage spring 16 passes the middle, the first cam 5 and the connecting rod 7 are in a coupled state, and the energy storage spring 16 releases energy, quickly driving the linkage assembly 4 to drive the main shaft 3 to rotate together, thereby driving the knife switch to close. Compared with the prior art, the closing speed of the knife switch is not limited by the hand speed, ensuring the closing speed, shortening the arc generation time, and extending the service life of the contacts.
[0035] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the creation of the present utility model.
Claims
1. An isolated grounding three-position mechanism, characterized in that, include: The operating shaft (2) and the main shaft (3) are rotatably mounted on the switch body (1); A connecting rod assembly (4), comprising a first cam (5) rotating in conjunction with the operating shaft (2), a second cam (6) rotating in conjunction with the main shaft (3), and a connecting rod (7) arranged between the first cam (5) and the second cam (6), wherein the connecting rod (7) has a first shaft (8) cooperating with the first cam (5) and a second shaft (9) hingedly connected to the second cam (6), and the first cam (5) is formed with a movable groove (10) for the first shaft (8) to move therein; An energy storage spring assembly comprises an energy storage crank arm (15) and an energy storage spring (16), wherein one end of the energy storage crank arm (15) is fixed to the main shaft (3), and the other end is used to cooperate with the energy storage spring (16); When the switch is closed, before the energy storage spring (16) passes the center, the first cam (5) and the connecting rod (7) are in a separated state; after the energy storage spring (16) passes the center, the first cam (5) and the connecting rod (7) are in a coupled state.
2. The isolated grounding three-position mechanism according to claim 1, wherein When the first cam (5) and the connecting rod (7) are in a coupled state, the first cam (5), the connecting rod (7) and the second cam (6) form a four-bar linkage, and the four-bar linkage comprises a first connecting rod (11) formed by a line connecting the center of the operating shaft (2) and the center of the first shaft (8), a second connecting rod (12) formed by a line connecting the center of the first shaft (8) and the center of the second shaft (9), and a third connecting rod (13) formed by a line connecting the center of the second shaft (9) and the center of the main shaft (3), wherein, in the closed position, the angle a between the first connecting rod (11) and the second connecting rod (12) is between 0° and 7°, and the four-bar linkage forms a locked state.
3. The isolating grounding three-position mechanism according to claim 2, characterized in that, The switch body (1) is provided with a limiting structure for limiting the connecting rod assembly (4) to a closed position, the limiting structure comprising: A limiting boss (17) is provided on the second cam (6); The limiting shaft (18) is arranged on the switch body (1) and is located below the main shaft (3). The limiting shaft (18) can abut against the limiting boss (17).
4. The isolated grounding three-position mechanism according to any one of claims 1-3, characterized in that, The energy storage spring assembly comprises: A connecting rod (19) and a connecting sleeve (20) are arranged on the left and right, the connecting sleeve (20) is formed with a slot (24) for inserting the connecting rod (19) and allowing the connecting rod (19) to move, a first spring seat (21) is provided at one end of the connecting rod (19) away from the connecting sleeve (20), and a second spring seat (22) is provided at one end of the connecting sleeve (20) away from the connecting rod (19); An energy storage spring (16) is sleeved on the connecting rod (19) and the connecting sleeve (20), and two ends of the energy storage spring are respectively in contact with the first spring seat (21) and the second spring seat (22); The energy storage crank arm (15) is connected to the first spring seat (21) or the second spring seat (22) via a third shaft (23).
5. The isolated grounding three-position mechanism according to claim 4, characterized in that A spring limit shaft (25) which abuts against the energy storage crank arm (15) in the opening position is provided on the switch body (1).
6. The isolated grounding three-position mechanism according to claim 1, characterized in that, The movable groove (10) is an arc-shaped groove.